Hach® QT Filters are recommended for use in various Hach Water Analysis Handbook Methods and other environmental reference methods. Optimized ashless hardened circles provide an abrasion resistant smooth surface which is ideal for gravimetric procedures utilizing Büchner funnels and high vacuum. Pleated filters, increase flow rates by doubling the effective filtration area of the same diameter filter circle compared to quadrant folded filters. Available in a range of retention ratings, circle diameters, and pleated formats, Hach has a QT Filter that’s right for your critical wet chemistry or environmental application.